Linear regression analysis of the causality parameters on age during STAND.

CRSAP→HPMB, CRSAP→HPLP, CRSAP→HPCE = causality ratio from SAP to HP series derived from MB, LP and CE approaches; CRHP→SAPMB, CRHP→SAPLP, CRHP→SAPCE = causality ratio from HP to SAP series derived from MB, LP and CE approaches; CRRESP→HPMB, CRRESP→HPLP CRRESP→HPCE = causality ratio from RESP to HP series derived from MB, LP and CE approaches; CRRESP→SAPMB, CRRESP→SAPLP CRRESP→SAPCE = causality ratio from RESP to SAP series derived from MB, LP and CE approaches; CRHP→RESPMB, CRHP→RESPLP, CRHP→RESPCE = causality ratio from HP to RESP series derived from MB, LP and CE approaches; CRSAP→RESPMB, CRSAP→RESPLP CRSAP→RESPCE = causality ratio from SAP to RESP series derived from MB, LP and CE approaches; r = Pearson product-moment or Spearman rank order correlation coefficient; Yes/No = the variable is/is not significantly related to age with p<0.05.